Review of abalone culture and research in New Zealand

10 Pages·1997·5.3 MB·

by  David R Schiel

Moll. Res. 18: 289-298 (1997).
Review of abalone culture and research in New Zealand
David R Schiel
Marine Ecology Research Group
Department of Zoology
University of Canterbury
Private Bag 4800
Christchurch 1, New Zealand
e-mail: [email protected]
Abstract
Despite interest and research in abalone aquaculture since the 1970s, the abalone farming
industry is still in a nascent stage in New Zealand. The current aquaculture industry is
based on mussels, salmon and rock oysters, and only trial marketing of cultured abalone
has been done. The research on abalone in New Zealand reflects a young industry, with
the largest category of published papers since 1990 on spawning and settlement. The
Status of the industry and research related to solving éritical problems are reviewed. The
major areas requiring more research are in overall system development and integration
with food and stocking densities, food development both for recent settlers and later
stages to achieve greater growth rates and lower variability among abalone, and algal
harvesting effects and techniques to provide the information necessary for more harvesting
permits to be granted. The industry will have to be increasingly focused on marketing and
product development.
Key words: Abalone, Haliotis, aquaculture, New Zealand, Review
Introduction
As in most countries with a history of abalone fishe ties there is considerable and increasing interest
= abalone aquaculture in New Zealand. The reasons for this broadening of the production base from
apture fisheries to farming have been discussed or mentioned in many publications and relate
Pactally to market awareness and demand, coupled with occasional management problems and
Imits to the wild catch (Shepherd ef al. 1992, Fleming and Hone 1996). In terms of research, there
ieat b2e5e%n ao fc hpaanpgeres inp reesmepnhtaesdi s at dutrhie ngF irtshte Ipnatsetr nasteivoenna l yeSarysm. poFsliemuimn g ona nAdb aHloonnee (i1n9 9169)8 9p orienltaetde d outto
; alone culture, whereas 50% of papers related to this topic at the second symposium in 1994. While
neer e ish anso t clneeacrelsys abrieleyn amno rea ccurreasteea rcrhe flpeucbtliiosnh eodf rtehcee notvleyr aloln raebsaelaornceh ceuflftourrt e onf roamb alao nwei dew orrladnwgied eo,f
Cth oIuesncmtuersissee sst. h asTto hmeee n cpaoopmfep ratshs essf er oamtb haeltmoheen es Serrceeolsnaetdair ncgIh n tteboru ntaa btaaillosnooan le maSanyqyum apcofuaslctituuorrmes uoannn id,q A ubseau lgogtneo set e assc hhho owcw o utnhrteerrseye .a arrcTeh h icsa io nm pmNaopeenwr
(cid:8364)aland can help the nascent industry and where it fails to solve industry problems.
(cid:8216) The primary premise of this review is that the main purpose of aquaculture is to make money. The
Orollary of this is that all research should be directed primarily at solving specific problems that
ee the industry in development and production. This is especially important where: research
meats are few and a form of funding triage occurs: the most needy problems should be identified
sh Solved first. Four arguments are the focus of this review: 1) that research into abalone culture
Ould have as a major component an assessment of the costs associated with developing techniques;
290 D.R.Schiel
2) that research should be aimed at specific problems impeding progress in establishing viable
aquaculture enterprises; 3) that the scale of experimental research and development should bé
appropriate to a commercial scale; and 4) that research should be appropriable by industry.
Background to abalone research in New Zealand
Three categories of background information are relevant to understanding the environment fo!
abalone research in New Zealand. First, the abalone catch from the natural fishery has been relatively
stable at around 1200t per year for the past decade (Schiel 1992a). There is considerable knowledgé
about the biology and ecology of the main fished species, Haliotis iris Martyn (1784), including
feeding and movement (Poore 1972a, b), growth and mortality (Poore 1972c, Sainsbury 1982);
morphological variation both locally and geographically (McShane et al. 1994a), reproduction (Poot
1973, Wilson and Schiel 1995, Hooker and Creese 1995), and fine-scale distribution (McShane et al.
1994b, McShane 1995). There has been considerably less research on the other two New Zealand
haliotids, H. australis Gmelin (1791) and H. virginea Gmelin (1791). ,
Second, the aquaculture industry is not large in New Zealand and is based on only a few specie
(Table 1). There are 65,000t of the green-shell mussel Perna canaliculus produced annually on long
lines, of which 21,000t is exported with a value of NZ$87 million. Salmon, almost all of which ®
chinook (Oncorhyncus tshwaytscha) grown in sea-cages, has a total annual production of 6,500t, °
which 5,000t is exported with a value of $34 million. Around 4,800t of the Pacific oyster Crassostre4
gigas are grown annually, of which 1,436t is exported. Although there has been considerablé
discussion about aquaculture in New Zealand, and the pros and cons of indigenous species have bee(cid:8221)
analyzed (Hayden 1988), little has translated into production. The aquaculture of paua has bee?
discussed and researched for at least 18 years but, to my knowledge, only trial marketing of products
and a small trade in production of larvae and juveniles have occurred. :
Third, there are few sources of funds for aquacultural research in New Zealand. The Foundatio?
for Research, Science and Technology (FoRST) provides most of the funding for all institutio(cid:8482)
research through its Public Good Science Fund. One output area is Fisheries and Aquacultul®
Industries, which has an allocation of $6.5 million (1996-97 figures), of which $1.5 million W%
specifically allocated for aquaculture production in 1996-97 (Anonymous 1996b). A few aquaculture
research programmes are funded by industry, mostly with matching funds from a schemt
administered by FoRST. Altogether, paua research has around 22% of the FoRST aquacultu
funding, with projects on larval settlement and enhancement of natural populations, while indus
contributes to others relating to food, algal harvesting, system development and pearl growth. ;
There has been a considerable amount of work on spawning, culture and rearing of paua since th
late 1970s and there is continuing enthusiasm shown by prospective industry participants F,
attending hands-on workshops in paua culture. Given this work and interest over many yeals;
seems reasonable to ask what has resulted from this effort, interest and expenditure. Why is there 2°
Table 1 Aquaculture production in New Zealand for 1995, including export tonnage, value, and total product
(domestic + export). Source of export figures: New Zealand Fishing Industry Board (Anonymous 199 F
salmon figures from N. Boustead (National Institute of Water and Atmospheric Research, pers. co(cid:8482)
NZ$1 = US$0.70 (at November 1996).
Species 1995 export figures Total
t $(million) t
(cid:8212)(cid:8212)(cid:8212)(cid:8212)(cid:8212)(cid:8212)(cid:8212)(cid:8212) a eS
Oysters (Crassostrea gigas) 1,436 11 4,800
Salmon (mostly Oncorhynchus tschawytscha)! 5,061 34 6,500
Mussels (Perna canaliculus) 21,258 87 65,000
' Sockeye salmon (O. nerka) have a total aquaculture production of 10-20 t annually
Research review of NZ abalone culture
7
More than an incipient industry in New Zealand? Has the research been appropriate for the
Production of paua and development and expansion of the industry, or are there other factors
Primarily responsible for what can be seen as slow progress?
Research into paua culture
As evidenced by the papers published from the Second International Symposium on Abalone, six
Major topics encompass most of the research effort in abalone culture internationally (Table 2).
Attificial diets and nutrition have assumed considerable importance in the past few years, primarily
cause of the need for high quality foods that are predictably available. Various aspects of
usbandry, including the use of growth hormones (Taylor et al. 1996) and anaesthetics (White et al.
1996) were presented, while there were two papers on system design. The problems and opportunities
of marketing were discussed in one paper (Oakes and Ponte 1996). New Zealand research on paua
Produced 25 publications since 1990, 64% of which were related to fisheries and 36% to aquaculture
(Table 2B). In comparing the subjects of the 11 aquaculture papers to the spread of topics
internationally, only one was on diet and nutrition (Stuart and Brown 1994). The major categories
for New Zealand research were spawning and settlement (36%; Moss and Tong 1992a, b, BLES et al.
1995, Moss In Press), enhancement of natural populations using hatchery-raised paua (18%; Schiel
1992b, 1993), and analysis of stress on paua due to handling and shipping (18%; Baldwin et al.
1992, Wells and Baldwin 1995). Other categories were system design and techniques (Tong and
Ss 1992), and genetics relating to hatchery production (Smith and Conroy 1992). It therefore
appears that the research effort in New Zealand has a different focus from research in other countries.
°(cid:8364)s this reflect different problems in New Zealand, a different stage of development of the industry,
;. Something else? To answer these questions I categorise the problems in New Zealand paua
(cid:8220)Ming and outline what is known. Almost all of this relates to Haliotis iris, although some interest
'N other species is developing (e.g., Moss 1997).
Techniques for spawning and settling
elTsheweh erteec hn(iH aqhunes 19fo8r9 , spTaownnigng andM poausa s are1 99s2t)r.a ii Ignh tfboortwha rdH adl iaont iasnd rioiustui tnieane,n, d aHn.d aussitmrialalri s tgoo ntahdosse arues eadt
Table 2 The number and percentage of papers published o n selected aquaculture topics, A. from the Second
International Symposium on Abalone 1994 (from Aqu aculture 140, 1996), and B. since 1990 from abalone
A. From Second International Symposium on Abalone, 1994
Topic Papers ve
Artificial diets and nutrition 8 2
Post larval culture 1
Husbandry 3 6
Tropical abalone 1
System design 2
Marketing |
B. From New Zealand research since 1990
Topic Papers i
Diet and nutrition :
: 2 18
Handling stress 36
Spawning/settlement 4 9
System design/techniques I 18
Enhancement ; 9
292 D.R.Schiel
their smallest during late summer (Feb (cid:8212) Mar), although there is considerable local and regional
variation (Poore 1973, Wilson and Schiel 1995, Hooker and Creese 1995). Paua can usually be
spawned in all but the warmest summer months. Settlement is usually done on diatom-covered
panels, without the use of GABA (c.f. Morse 1992). The techniques used throughout New Zealand
are mostly those contained in a technical report (Tong ef al. 1992), which is used in workshops fot
training potential farmers in paua culture.
Early settler survival and growth
The growth and survival of post-settlement larvae are variable, with occasional high mortalities
(>90%) reported at around 3 weeks (L Tong, National Institute of Water and Atmospheric Research,
pers. comm.) when paua are c. 700um long and their radulae are developing more lateral teeth. High
mortality may, therefore, be associated with a change in food requirements, the provision of which
may depend on the mixture of available diatoms. Another factor may be oxygen depletion in the
boundary layer on the surface where post-larvae grow (Searcy-Bernal 1996). Specially formulated
artificial foods (e.g., Knauer et al. 1996), or the provision of specific diatom cultures, may help
reduce variability in survival and growth at this stage of development. A major programme funded
by FoRST, attracting $182,000 annually (Anonymous 1996b), deals mostly with these early stages of
post-larval survival and growth.
Despite the unknowns and the occasional problems with post-larval survival, it seems unlikely that
this is a major impediment to the development of the paua farming industry at this stage. While
variable early survival has a real cost, it is probably not great overall. Furthermore, hatcheries havé
been able to produce the numbers of juveniles required by industry so far. The problem of post-larval
survival may become more important as industry expands and requires vast numbers of juveniles fot
year-round production. This will entail having an optimal mixture of food and conditions for all
phases of juvenile growth, allowing predictable costings and cash flow in hatchery production.
Table 3 Current paua farming ventures in New Zealand (data supplied by R. Beattie, New Zealand Abalone Farmer's
Association, October 1996).
a(cid:8212)(cid:8212) (cid:8212)(cid:8212)(cid:8212)(cid:8212)(cid:8212)e(cid:8212)(cid:8212)(cid:8212)(cid:8212)e(cid:8212)eE eeEEE(cid:8212)E(cid:8212)(cid:8212)(cid:8212)(cid:8212)(cid:8212)(cid:8212)(cid:8212)eEEEE(cid:8212)(cid:8212)(cid:8212)Ey(cid:8212)(cid:8212)E(cid:8212)(cid:8212)(cid:8212)(cid:8212)(cid:8212)(cid:8212)EE
A. Geographic spread
Region Number of farms
Auckland/Northland 1
Taranaki 2
Canterbury 2
Otago 1
Stewart Island 2
B. Types of system used
Type Number of farms
V-tanks 3
High-sided, narrow tanks 1
Stacked, flow-through 1
Barrel culture 1
Unknown/Undecided 2
C. (cid:8212) Species used
Species Number of farms
Haliotis iris 7
Haliotis australis 1
H. iris and H. australis 1
ec a a
Research review of NZ abalone culture ore)
Food/diet/nutrition requirements
Ba=tiahanree aieeictaen rc ep eer r ea eha a e(aeaae neaz e eose a)a u re -a ooaf ei mfea efn e8nedd7acei, et t ausat rersS oaepto ml uefs ahcu roiosdstneewio e sfdena f vtatweoheionreefnre de n, dbmtan star Bu c1otrdlrrSwoieio nnewattate hsinslcato a tegn o ntasandwls1et o9ah le9rrrro4yeaiee)ntd n q .gdu asaufirrteosAreortear e urrtwmynimfeae fd e eni wfgdtcca riss5coao ipmmllwusm imtobteefh flier e oimscpssos.oihahd feaues lOljadt lnou . m ev lapae Ffenrndaunmdioecgra,ldi tt jeluhhiso.ctite r henyr e t mIropNnoet rr frhemeoeoetawq rbe,ru ebrl ik,emere sZspmett ers a aao pbogwlvplfiraiare tonsna hnw diia to sstanhifaulz obaregolansoaolded.lff
ccRmorsaelel BeSia ei s y, a(feFwl eomifinn waghn iyce th p ralho.ad vu1ec9 t9ib6oe)ne naf nagdcri altinthtyee. dc Aosrsott si ffiaocrfi. a lg atfhoeordin gm,a yt rcaunsrproernttilnyg bea ntdo o feeexdpienngs invaet urfaolr
ommercial scale are largely unknown.
Husbandry/tanks/systems
meTcoCIUmhnNeaiaip e inuymebaneSal eee ioT a s lE.hiii ecaee d1A H9= cme 9eeo6ode ee )na.e t aa-ac,nbt Eod. r aMaatfa ecoIhy nasghnesrd k ri res i neoa sncudor wogsilfi mue 1cen tsa9aagwtw ht9 nyhhoee2ine resrp,sank nna ergb. u rtT,e aho o Nt sawVhnteya,aeea gsw rdr npt etv tdae hiaeuiem cnuZmtgasaat sephv laeaae,algdf ilrlhye leaaa.r asetnse ibs 1d udcniti9t r,liain9aNie ctng2tn ske fy g)ewo.1u1 dohsr l ,s wh ea anmaOsrZeva rtn.eexeio iveaa tncunel mahtnargtpnaadne dhrkli dlieasewn.ysc.t a,e at aat derdndCeT rekvwvorhisdaha uase unnepbt cttardiolearVacueveedgs-gr e d e tie wp nasbaolgn w1efta 1ki5ls onest° owtnh rfCwaht e h etaadta et d( ta1revSl ncf0 macooko°sprhcl rCfogeiad l,dereretao telastewis tt wsd,ni uluuh ggerrne anwfaepirs iiasnuaetrnc bi na etsildos es nri n trusaseah ptrnhpr eprgeeea lumaefmdutyc,ao ,aoy,t cn piiv tfleeoiwrhican anito.ssanlyogfmy.ld,lf,
Methods of feeding and handling paua.
RmTeeTtcoe1aea e9gael 9hudae1 aeleaSr)akn te oeae rc:y.oi p ecat e(pn lnmsraa as uon ecSc ed hse a iw dhsninaau afadstonrrs -erdee r b bq s auam loisrcaainrroeinn-neendmtdgdlsy pa-.o i ak bifdfecaanearI ctsgrrefi eaa ml gdnntiiuatmad inlsyto ogas,unna;t erwsiq iasap,tuolset aon cmrecrs.eemrsu ifsni le,nptt rtagdesseuiw Ac lrseviemecaiaefv,hralldoaea elyrsn rys t ga r cenbea.oidaeqrt n menu o mdi rTcar eueh toeqsrehSdmumece h idap iree r faefpaioladlfhqrnis.e ueae cnalr dftccAadoesenu o f v dldaef ot,wr1rlfu iu9meo rst9 astpee6hnhh m) lew.ei( aat icnilhtdne.tgeeTdinea ruoss,ls eR c ot echfhfrbsaoaay u1orm.rrslyug p vma releinnc siTanedetahngne :iene d danscepen geededd sM r e aplmtwlunieif iosnratotve mpgr bhoi a e 1eltusomsv a lfeeed,or mna ec enuta-tqaslaab lut itoaiulc sAfrareaeicaebnldstdld,,edh
.ie mtpeende;e p rcaotb ijvieencl tyti iomncesu mabanneddr smopomrnoeec,ey e dtiihnneg sob rteaagriuenl iantdgor raywa lnl roeofqu tu.ti hreeW mhneienlctees s stahrbeyy pptreohrcememidstuesrl evsce asn mabayree hbipegr ho,eb xapebeslnpyse icivnaeol tl ya nadinf
iment to industry progress at this stage.
Marketing/product development
eamn4ide nmt Ra.onhy GaBZrege a ul eeiad nn.sti dThd ahecta eo tc rtokhelftie sa as iishshtl e,a-la slsls iis.zotb ee idTsec(cid:8221) ono n nospttdi haadetuye eaer,m t aa b(hjclaoolerrwe o aeruvir nneetdwrae h,sraoe 7snt0tt hmmefti m ohnre i npscmasuihaucperahilk lee n(cid:8220)sttpll eeoaniwirgns l tdsphuf(cid:8221)r)os,or t grbrmycue outsls hstta unlsroyie n d nb cotllthipe esaa tbrued eare.e m nvap eTrelahkmoreeapltrrsmsek e e(tnhoh-tarad s vr meioa vfbe ebytneeeh,n)et
Paua farming industry.
294 D.R.Schiel
Investment
Potential investors have been wary about aquaculture since the late 1980s, when it became cleat
that the hype surrounding the industry was not producing quick results. There are high start-up costs
in land, plant, materials, and permits, and there is no clearly established market for mass-produced
small paua. There is a long lead time to produce even moderate cash flow, and a longer time for real
profits. No single system of plant, feeding and techniques is readily available to give a reasonable
degree of predictability about production and costs. Many of these problems have not been resolved
sufficiently to attract investors.
In many ways, there are striking parallels between the paua culture industry today and the mussel
(Perna canaliculus) industry in its early stages of development in the 1970s. Most investors ar¢
individuals or small companies, often beginning with inadequate longer term finance. As in the early
mussel industry (Meredyth-Young and Waugh 1985) many types of production systems are used and
markets are not clearly defined. It was not until more standardized equipment and procedures wert
developed, coupled with the involvement of larger fishing companies in terms of finance, processing
plants and marketing, that the mussel industry underwent major expansion. Major steps in progress
were the development of specialized spat collecting methods and the evolution and availability of
separate growing and harvesting specialties, so that one operator no longer had to be responsible for
the entire process. Some degree of standardization and specialization will certainly be necessary 19
the paua industry, but it is too early to see exactly what form this will take in New Zealand.
Paua farms in New Zealand
Most paua farming ventures in New Zealand are in an early stage of development. The geographi¢
spread encompasses the length of the country from Auckland in the north to Stewart Island in the fat
south (Table 3A). Most farms are in the cooler waters from Taranaki (west coast, North Island)
south. The most common system being used is the V-tank, although there is a wide range of types:
with two operations still in the early planning stages (Table 3B). Seven farms will use Haliotis iris,
one H. australis, and one both species (Table 3C). The products will be cocktail-sized paua and mabe
pearls.
Husbandry and system interactions
Several models of husbandry and systems are being developed throughout the country. This
diversity may be necessary because of regional differences in water temperatures, particularly with
the significantly warmer water in northern New Zealand (monthly averages between c. 12 and 21°C)
and site-specific differences in water quality and access, even within regions. There is considerable
debate about which combination of traits, species and systems is best suited to any given operation.
There is also the suspicion that in many cases the sites for paua farming are chosen more fo!
convenience or prior land ownership, rather than for the quality of the site for paua farming. 4
In southern New Zealand, heating the water during the coldest winter months could result 19
increased growth of meat and shell, although there is no published information to gauge this relativ¢
to costs. If water heating is used, heat pumps will be required and a re-circulating water system tha!
provides constant temperatures to all tanks will be necessary. Also needed will be a filtration syste(cid:8482)
to remove major wastes and a bio-filter system to maintain water quality. Such an integrated syste!(cid:8221)
has yet to be tested on a commercial scale. It will also require the use of food that will not clos
filters; the break-down of artificial foods can cause problems with this. Size-specific stocking
densities will have to be worked out, and the entire system will have to permit easy removal °
faeces, food wastes, and paua. Few of these have been subjected to direct research in New Zealand.
An ancillary problem relating to paua aquaculture is the provision of juvenile stock. It seems clea!
that specialized hatcheries will need to be developed to provide small paua (5(cid:8212)10mm) to othe!
operations. The current price (October 1996) for juveniles ranges from 1.4 to 4 cents per mm, but !
is felt that for profitability in an on-growth facility, NZ$0.02 per mm may be the maximut!
affordable for commercial viability (R. Beattie, NZ Abalone Farmer(cid:8217)s Association, pers. comm.):
Research review of NZ abalone culture 2
JOunveen iplreos blleomw , aat ndt hiwsi tsht agnee w iso ptehrata totrhse reb eiisn gn oht eseitnaonutg ht o vboulyu mpea uao f atp rao dhuicgthieorn prtio cek,e etph e tdhee maprnidc e foorf
Juveniles is not steady or high enough to produce economy of scale.
_ The problem of stock provision is more problematic if pearls are to be produced. The minimum
Ifimsphlearnyt asti z1e 25ofm mp,a uai t wiisl ln otb e clce.ar7 5wmhme,r e ort h2e- 3v oyleuamres oolfd .a pWpirotphr itahtee lmy insiizmeud m palueag alwi lsli zec ofmoer tfhreo mn atfuorra la
Commercial venture in paua pearls.
Provision of food
dtafneoh noTesdho bisenet -sygtw n iouoliftflnro giprt bamieuuoc lanoa aintlnici fneo lrrnpunea e rqntfucioiienrcrd ue Nlfmaaebesrwt ny t sgsytrZ shoeteawo eltfmpah san,.pud aa,ueT afhf aseisp c aeirpceieirtn eotis vls,ia c rseogitlneoesvlnmeey prw esohurifeaon rqtnekuu, nar ole(imw,Fte nlya e tpmf riaoonnqodudgdua lctittehthitaye ot, na l qi.tus a oasafl1tli9 es t9woy6a a )sne.tda ce nosFdnn o aorcmau risneaecd r a tpliotfrlhfioyec di paualvscr itttaoifibcooclkouneidl nsaii,rgss
still being developed.
OW5fe0 Timphgamehu at,a a mbcoawoulannotstneu erm oeft(d ef fmropopoemedr r a Trtadeubaqrlyueei raeav6dne, d rb Fayglde eusamr iactnoicgm.o mne 4er%toc fia alf.flo er-e s1d9c7i9an26lg)e0 . mbfmyHao c iwpleaiauvtbayea. rl w,oin (cid:8220)leDl athidaeletry pe e1ni8mdn-at 2yao2k n°e (cid:8221)bC es teoacxcnopkdnri senisgcd s.e edrdea1 nb.sl1aies%t i e%swf, ao rsB tsoia2zdg5eye(cid:8212)s
atlTo. o mm1a 9x9ui6nm)ei.a zteeWn i tghfr ooowtdth eh ancrodas tte d eomcfao yma prtobisfeii ctdiiaoolu nb,lf eo oadnt dhe p rtedhsaeie lnoytv leyir natlhalik geah mvoa(ulanune t av(oeUfrk aifg oeoe td oafla .d cd1.e9Nd8Z 5$,t4 o .q5au 0ot taenpdke r i(knt ghF;el (cid:8220)eTrmaaibtnligeo n(cid:8221)e1)t,
WCFoalusertmseiesn,,g tahneitds amrl.ae dyu 1c9e9cd6h) a,n fgoeto hde wicetochso tsn,co omnbitucitsn utehodef r ei memiapstr oclvpeeramroeldynu tctsai olnio nn gog frw oapwyatu ha t or aatrgee0s , cfuocrror nedvneetrmlsoyin osuntn rsaarbtailtseifo asc,e tcororenydo.u mcieOcdf
Viability using artificial food alone. ; :
WilIlf nbaet ugrraaln tsede,a weaendd s hoawre mtou cbhe uwsielld biet inse neodte dc.e rtAa inc omwmhiecrhc iaslp ecfiaecsi liatrye cbleesatr, lyi fw pielrl mirtesq uitroe hahruvnedsrte dtsh eomf
tCoolnlneecst iopne r ayneda r,t rabnustp ortth e arseo urmcoes tloyf suuniktanbolwen ,s eayewte ecdrsu ciraell attoi vet het o pltahen nilnogc atnieocne sosfa ryf ar1mns ,a tchoem mceosrtcsi aolf
Operation.
Research scale and experimental designs
tawaeedd9tfqefape(cid:8364)i nAffuIeytmfseaefarse oiBcc c ca,crnortAttu etrsd ueiil ec ersvewotasanraeevnaulenoo ag esers annren. et r -tc e,rchshfa ehdstaAi fpta teheebgbp tehtticunor( msetottinouS e cluu fotpetntesgtoiawrat eem hlcai r des aaasa cnooin o t(ytn dtGfteda l- th toi AyBhit Gnaaa rrehBtlsftAndeeroye oa sd ABnrmt rus oade stAl of l1etl)st,m s e.9vurrtpe m %reahire evn,alegtTnoesir oomtvfdevwaprpe, eeaauloao armnl.nci pur s edenaesbun1 tdmlru torte9 tas hfter9 ejho p 2taxoaurltooi)tnprehgoa nf ete rf h c aerviS ipadocantinedov. ehicmmdaii tew eeumerfn rhpsmnefHctwapittitersyeegroicrga c-r eynwhehlBie, agne i te r a clre rltolet d tnthu pf heeheasge orsse tl eafuot2 ir(cid:8217)esre smd.agfeasndmc6uton.f .u ia ec sent lednce el(gt nset US 1i cts:thse9 hme sei ia9eyt tissonro4sprtg twf cg)ioenhpi dy n iatalobegtfi-thliretA inBm enenencceetsthctvsaarnhristhapinelet n sieveta ysa cceaw bss isl n e yiiotf wadstfimietoia cc np(i ifa sintsr1nfbtto oet 9oheeiof irs9cyvn cm npu4ttagpsoeroVlr )rt,oemfas ve a tt ehrnaiepahonsipa tvd oeiutrabm hawesglensaeilaenxedscln g isar etoehnf m noib n ionpvteecno sneaeel a- ftfe rcdendsf mac so t eietneui mcghtdstgaftcenmeahas n r iufeeriraotft twfrmsdremiieio yicr s lcmc tnuieaaaea haelannn2nlis1tdddlttd2syDto
Nt8(cid:8216)uhroliMomls wpunmhac yrahpiyf on otrgrhne oesttsewg aiorrsb oc ewht at osp h ai trniht froi aeifcqet u u wlsayaemcerraualellry lst .ut urrpsueAaee n,fu u ailsa i nldd(lto 1oun s5net aor n (cid:8212)a otpiniav2 npe5der uremselsmtax )rtaryi mev pepowlloniyer tt hesf fdmor aluolartmrl hg ee aNs lscgetfaaaawlltce i issl tdZiiiteoceiavaetellss r a npw(doisSw thtehourriare.nrts t e taw: irhamcniehdc hpie sBr priaaoo udwfasne .e ndiHe1noe9gwd9 e4 )vst.toe urdb,Aye
296 D.R.Schiel
recirculating system with a total volume of 250 litres was used, with 5.2 litre glass jars used to
hold treatments. There were four algal treatments, each containing three replicate jars with 40
paua. The experiment measured growth rates over 8 weeks when the water temperature was 15°C.
Gracilaria produced growth rates of 9.7 + 6.1 mg per day (x + SE), Macrocystis 5.9 + 3.3, Ulva
0.8 + 2.1, and a mixed algal diet 11.6 + 8.1. Using Covariance Analysis (comparisons of the
different diets over time), they concluded that Gracilaria and mixed algae produced significantly
greater growth rates than the other two treatments. Three points are relevant in applying this type
of experiment to commercial use. 1) The experimental scale is so small that results may not
translate to the much larger systems used in commercial culture. The spacing of paua, aeration,
water flow, and effects of wastes are likely to interact in a different way in a large system. 2) No F-
values were given in the experiment (only p-values were cited) and the variation due to separate
jars within treatments was not separated from individual paua variation with treatments. The
assumption is, therefore, that there was no between-jar within-treatment variation. These omissions
combine to make it difficult to assess the power of the test used to detect effects. Because the
individual variation within treatments was so high (standard deviations ranged from 22.9 to 88.4)
and there were relatively small differences among three of the treatments, the power of the test to
detect effects was probably low. In this case, this did not lead to a Type II error because the result
was significant. 3) The treatments lasted for only eight weeks. Because of this short time span,
compounded with the great variation in growth within treatments, the results may not be
particularly helpful for a commercial operation.
A recurring lesson is that aquaculture researchers must continually grapple with high within-
treatment variability among individual paua combined with relatively small effect sizes. There are
usually logistic constraints on the number of treatments and replication possible, all of which
combine to yield generally low statistical power in the critical tests. This may be especially serious
where percent survival is the variable being measured. In this case, there is no within-replicate
variation (as is the case where several paua are measured for growth within replicate containers) and,
therefore, there is a need for greater replication of containers within treatments to achieve 4
reasonable level of statistical power.
The role of the market
Because the aim of aquaculture is to make a profit, the combination of production system traits,
growth of paua, and relevant research will affect the ability to attract investors. Not only will
commercial facilities be increasingly driven by market forces, centred on identifiable and branded
products, but there will be increasing pressure on scientists to interact with industry to solve
problems. A major challenge to scientists, at least in New Zealand, is to demonstrate the relevance of
research and science to the aquaculture industry through high quality research that leads to real
commercial applications.
What can research accomplish?
I see the major categories needing research attention for the advancement of paua culture in New
Zealand as: overall system development and integration, including the interaction with foods; food
development both for recently-settled and later stages of paua to achieve better survival, greater
growth rates and lower variability; algal harvesting effects and techniques, to provide the information
necessary for more permits to be granted and for gauging the relative costs and benefits of artificial
vs natural foods; and perhaps a better understanding of the genetics affecting meat quality and
colour, growth rates, and shell colour.
Overall, despite the current progress of the paua culture industry in New Zealand, there is good
reason to be cautious in optimism. Many places worldwide are further developed in abalone
aquaculture, and wild stocks of paua are still reasonably plentiful, so there will have to be very good
marketing to sell products and keep prices up to meet the expectations of investors. Some successful
niche markets are likely to arise, and progress in the production and marketing of paua pearls may
Research review of NZ abalone culture 2
Prove to be the greatest success. However, history to date encourages me to wait and see, rather than
to predict a clear road ahead.
Acknowledgments
,ao crTk hndaoinswckluses dsgiteoon ,Dt rhsei nPcf oorMmmcmaSethniatonsne ,ao nf dLa nc Troaintnigoc,an ly mBco oHumasmy ednretenfs,e, r eMea nwdWh ionD tret roMobk o uBerexnac redpastneidlo ln S ftoSorh empporhsoetvr idod,fi ntgah nisd i nrtfeoov riRmea wt.Bi eoant.t ieI
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